Appliance base



FIG. 1 is a front perspective view of the appliance base;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is right side view thereof; and,

FIG. 6 is a top view thereof.

The missing bottom view and broken lines depict portions of the appliance base that form no part of the claimed design. 

CLAIM The ornamental design for the appliance base, as shown and described. 